package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    //新增菜品和对应口味
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //向菜品表插入一条数据
        dishMapper.insert(dish);

        //获取insert语句插入自动生成的主键值
        Long dishId = dish.getId();
        
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    //菜品分页查询
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    //菜品删除
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断是否存在起售中的菜品
        for(Long id: ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == 1){
                //处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断是否被套餐关联
        List<Long> setmeamIds = setmealDishMapper.getSetmeamIdsByDishIds(ids);
        if(setmeamIds != null && !setmeamIds.isEmpty()){
            //当前菜品被套餐关联，不能被删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        for(Long id: ids){
            //删除菜品表中数据
            dishMapper.deleteById(id);
            //删除关联的口味
            dishFlavorMapper.deleteByDishId(id);
        }



    }

    //根据id查询菜品和对应口味
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查菜品
        Dish dish = dishMapper.getById(id);
        //根据菜品id查口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查询结果封装到vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    //修改菜品
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);
        //删除菜品原有口味
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入新口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }



    }
}
